1. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 1 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced floods and sediment movement Benchmark BM UCL 1 Université catholique de Louvain Benoit Spinewine and Yves Zech

2. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 2 Benchmark BM UCL 1 1D dam-break flow in the near field –Uniform material –Same bed levels National Taiwan University

3. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 3 Physical description t = 0.0 s t = 0.2 s t = 0.4 s

4. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 4 Physical description

5. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 5 Physical description

6. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 6 Analytical description

7. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 7 Experiments Material –Uniform cylindrical PVC pellets –D = 3.2 mm - H = 2.8 mm –Equivalent spherical D = 3.5 mm –Density = 1540 kg/m³ –Static granular packing   0.60

8. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 8 L = 0.10 m Experiments Initial conditions –h 0 = 0.10 m; h s  0.05 m –Downstream sediments saturated h0h0 hshs

9. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 9 Measurements Layer boundaries Visual observation Velocity gradient Automated detection

10. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 10 Measurements Velocity: particle tracking (200 fps) Tracking of tracers particles Bed material tracking

11. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 11 xb (t)xb (t)xf (t)xf (t) Expected results Wave propagation –Front wave x f (t) –Back wave x b (t) –t = 0.05 s 0.10 s... 2.00 s –  t = 0.05 s x t

12. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 12 Expected results Interface levels –z b (t) z s (t) z w (t) –x = - 0.50 m - 0.25 m 0.00 m 0.25 m 0.50 m 0.75 m zwzw zszs zbzb z x

13. Mo-i-Rana - September 2002 Dam-break floods and sediment movement 13 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced floods and sediment movement Benchmark BM UCL 1 Université catholique de Louvain Benoit Spinewine and Yves Zech